- Reaction score
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- more celtic
- Y-DNA haplogroup
- R1b - L21/S145*
- mtDNA haplogroup
From the Google Bard:
Proto-Indo-European root isro-, sreu means "to flow." It is a verb root, which means that it can be used to form verbs. The root is found in a number of Indo-European languages, including Sanskrit, Greek, Latin, and Old English.
The meaning of the root is likely related to the idea of something that moves smoothly and continuously. This is reflected in the words that have been formed from the root, which often have meanings related to movement or speed. For example, the Sanskrit word iṣiras, which means "swift," comes from this root.
The root isro-, sreu is also found in a number of compounds, such as the Sanskrit word srotas, which means "river." This word literally means "that which flows," and it is a good example of how the root can be used to form words that have meanings related to movement or speed.
Here is a table of some of the Indo-European words that have been formed from the root isro-, sreu :
Sanskrit........ iṣiras...swift, quick
Old English...serian....to flow
From the Wikipedia :
Chapter, Names and etymology of the article Danube, https://en.m.wikipedia.org/wiki/Danube#Other_names
"The 《Danube》 river was known to the ancient Greeks as the Istros (Ἴστρος) a borrowing from a Daco-Thracian name meaning 'strong, swift', from a root possibly also encountered in the ancient name of the Dniester (Danaster in Latin, Tiras in Greek) and akin to Iranic turos 'swift' and Sanskrit iṣiras (इषिरस्) 'swift', from the PIE *isro-, *sreu 'to flow'.
 《Open access》 Felecan, Oliviu; Felecan, Nicolae (2015). "Straturi etimologice reflectate în hidronimia românească" (PDF). Quaderns de Filologia: Estudis Lingüístics. Universitat de València. 20 (1): 254. doi:10.7203/qfilologia.20.7521 "
From a dilettante layman:
I would also venture to speak of a branch of the 1⁰ wave along the Mediterranean coast, where the names vary around Ézar... and Éser..., and another along the Danube-Rhine where the names vary around Isar..., Iser... . This 2⁰ branch has a subgroup in Germany and the Netherlands, in Issel and IJssel.
Thanks for doc. I read this before too with less details, and I don't doubt in any way of the common origin of almost all the words you cited. But for Czech and other Slavic words (for 'lake' BTW, which is the contrary of a moving water) in jezer- or ezer- proposed another try for etymology, knowing that the Slavic Z matches almost everytime an ancient G.
That said, river names don't change very often and could mark ancient occupations by mankind. The question remains the datation of these namings. We could believe in very ancient settlemets of the namers in Europe and elsewhere because this layer of rivers names is very large. But the apparent unity spite some phonetic evolution and the countries covered evokes me a rather swift and coherent colonisation of Europe and so very possibly IE speakers. But who kows exactly?